My puppy was hit by a truck! DO NOT suggest i put her down- i refuse?

Ok i have a pitbull puppy and yes i mean a puppy! They said she was like around 8 weeks or a little older and that she was big for her age. Well she is an inside dog. NOTE: she only goes out when i'm with her or if someone is watching her. Well people were goin in and out the door, my friend i live with was leaving the house, (wasn't aware that some idiot let her out the house) then i heard all kinds of yelping, barking, everything. I didnt know it was her or even thought it could be her cause she hardly ever goes outside and plus i had just seen her literally 3 mins. Previous to that! But i've been so wrapped up in her since it happened that i lost count of the day of the accident. Approx. Like 3-4 days ago. Im confused because she has lived this long, but im very happy & thankful. She doesn't cry or wine unless you leave her alone, she can't seem to get comfortable now. She was ran over on her back end. It looks like her tail bone is popped out of place. Her legs look and feel paralyzed, she drags herself by her two front legs and can hold herself completely up whole body and all. she does urinate on herself tho. (i bathe her right after). she does eat: so i feed her very often, i keep her hydrated, cushioned, right temperature, very rare amount of times that i leave her side. i have givin her everything i can except medical attention, we are able to take care of her money wise but everyone goes through a "being broke" stage and i am unfortunately in that stage at the worst time when my baby girl needs me most. I AM the ONLY one that is making an effort to take care of her and i feel like im not enough. She is still a happy dog, wags tail (her tail does move????) , still trys to play back when you grab her mouth...but just because her spirit is happy that doesn't her body is.. :'( this puppy is my world! And it's pitiful that someone of my age is handling this situation alone. I have called all vets within my area, how can i help her without money?